The new 34th Street-Hudson Yards subway station under 11th Avenue, unveiled to the public today, will be one of the coolest additions to the subway system — literally.

The 7 line station is “air tempered,” meaning the temperature on the lower mezzanine and platform will always be maintained between 72 and 78 degrees year-round.

The $2.4 billion station is nearly two years behind schedule, but the sleek facility should impress commuters.

From the upper-level mezzanine, straphangers can ride down five high-rise escalators or two custom-built inclined elevators to the lower mezzanine.

It’s the first time diagonal elevators have been used in the subway, and their tricky design was one of the reasons for construction delays.

At 125 feet below street level, the subway platform is accessed from the lower mezzanine by eight sets of stairs and an elevator.

The platform is one of the longest and widest of the city’s 469 stations — the station extends 1,200 feet under 11th Avenue.

Artist Xenobia Bailey created two mosaic installations for the new station, swirling cobalt-blue universes with brightly colored gold, red and white sun-like circles. One hangs over the escalators; the other is on a ceiling dome in the upper mezzanine.

Bailey’s intricate works started off as handmade crochet pieces which were digitally scanned and turned into mosaics.

Around 9.85 million passengers are expected to walk through its turnstiles in its first year.